28180169 has 8 divisors (see below), whose sum is σ = 30216960. Its totient is φ = 26185536.

The previous prime is 28180151. The next prime is 28180177. The reversal of 28180169 is 96108182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28180169 - 2⁸ = 28179913 is a prime.

It is a super-2 number, since 2×28180169² = 1588243849737122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28180189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9149 + ... + 11834.

It is an arithmetic number, because the mean of its divisors is an integer number (3777120).

Almost surely, 2^28180169 is an apocalyptic number.

It is an amenable number.

28180169 is a deficient number, since it is larger than the sum of its proper divisors (2036791).

28180169 is a wasteful number, since it uses less digits than its factorization.

28180169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21079.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 28180169 is about 5308.4996938872. The cubic root of 28180169 is about 304.3088137581.

The spelling of 28180169 in words is "twenty-eight million, one hundred eighty thousand, one hundred sixty-nine".